Effect of twin boundary on the initial yield behavior of magnesium nanopillars under compression: molecular dynamics simulations

H Mei and S Xu and LS Liu and WC She and J Li and ZY Fu, MATERIALS RESEARCH EXPRESS, 5, 026513 (2018).

DOI: 10.1088/2053-1591/aaab91

Nanotwinned Mg nanopillars under uniaxial compression were investigated by molecular dynamics simulations. The simulation results indicate that more 10 (1) over bar1 < 10 (1) over bar(2) over bar > TBs and less 10 (1) over bar2 < 10 (1) over bar(1) over bar > TBs are recommended to introduce for obtaining Mg nanopillars being of higher compressive yield strength. The pre-built 10 (1) over bar1 < 10 (1) over bar(2) over bar > TBs restrains the nucleation of new twins, and subsequently causes the increase of the yield strength. The initial yield behavior of nanotwinned Mg nanopillars with 10 (1) over bar1 < 10 (1) over bar(2) over bar > TBs was found to be twinning nucleation, and the nucleation mechanism is a shuffling mechanism. The introduction of 10 (1) over bar2 < 10 (1) over bar(1) over bar > TBs bring sources of dislocations into Mg nanopillars and subsequently causes the decrease of yield strength.

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